A plant virus can now ferry CRISPR edits into leaves
Khwanbua E, Lappe RR, Bierl AA, Whitham SA
Crispr
Home gardeners tinkering with houseplant genetics someday might not need years of tissue culture, since infecting a leaf with a modified virus could edit its genes in days instead of generations.
Researchers took turnip mosaic virus, which normally just infects plants and makes them sick, and turned it into a delivery truck for gene-editing instructions. They loaded it with a guide molecule that tells the CRISPR scissors (already built into the plant) exactly where to cut, and added a bacterial helper protein called Csy4 that boosted editing success in leaf tissue up to 23%. The edits worked well in the leaves they infected but didn't reliably pass down to seeds, so this method is useful for quick lab experiments on existing plants rather than creating permanently edited new varieties yet.
Key Findings
Adding the Csy4 endoribonuclease boosted editing efficiency in infiltrated leaves to 7.1%-13.8% for one PDS gene and 7.6%-23.0% for a second, compared to low baseline rates without it
The TuMV-Csy4 system successfully performed multiplex editing, targeting two different genes (NbPDS and NbChlH) simultaneously regardless of guide order
Despite testing a tRNA mobility element to promote heritable editing and screening about 20,000 seedlings, no albino (fully edited) progeny were recovered, showing edits stayed largely confined to somatic tissue
chevron_right Technical Summary
Scientists engineered a common plant virus to deliver gene-editing instructions directly into tobacco relative plants that already carry the CRISPR cutting machinery, achieving up to 23% editing efficiency without needing to breed new plant lines from scratch.
Abstract Preview
Original paper
Turnip Mosaic Virus-Based gRNA Delivery System for Plant Genome Editing.
Plant virus-based gRNA delivery systems offer a rapid alternative to stable transformation for CRISPR-mediated genome editing, but potyvirus-based platforms in Cas9-expressing plants are still unde...
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